[求助]新手求助~（关于初级的神经网络问题） [复制链接]

各位大虾，我在网上看到的教程里的一个程序段，本来想要试试看的： azcPeAe  
net=newff([-1 2; 0 5],[3,1],{'tansig','purelin'},'traingd'); 5{Cz!ut;tE  
net.trainParam.show = 50;  ao(T81  
net.trainParam.lr = 0.05; tF2"IP.  
net.trainParam.epochs = 300; hbjAxioA  
net.trainParam.goal = 1e-5; c/{FDN  
p = [-1 -1 2 2;0 5 0 5]; |"H 2'L$  
t = [-1 -1 1 1]; 1^iBS  
net=train(net,p,t); ^5mc$~1`  
TRAINGD, Epoch 0/300, MSE 1.59423/1e-05, Gradient 2.76799/1e-10 !e$gp(4  
TRAINGD, Epoch 50/300, MSE 0.00236382/1e-05, Gradient 0.0495292/1e-10 ,Q`qnn&  
TRAINGD, Epoch 100/300, MSE 0.000435947/1e-05, Gradient 0.0161202/1e-10 Bq0 \T 0,  
TRAINGD, Epoch 150/300, MSE 8.68462e-05/1e-05, Gradient 0.00769588/1e-10 R>Ra~b  
TRAINGD, Epoch 200/300, MSE 1.45042e-05/1e-05, Gradient 0.00325667/1e-10 s-i|P  
TRAINGD, Epoch 211/300, MSE 9.64816e-06/1e-05, Gradient 0.00266775/1e-10 "Fz.#U  
TRAINGD, Performance goal met. DwD$T%kF  
a = sim(net,p) t [QD#;  
plot(p,t,p,a,'o') |WS)KR !  
但是为什么老是报错： Cs $5Of
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??? Input argument "net" is undefined. QYJ EUC@